I don't know your circumstances....if you travel a long way, spend a lot of money or have to skip work to attend this OD. But even if you have to do all this, just feel confident and do your best to achieve your goal.
If you really want this then you should go for it... Decide what would worth most for you and if doing your best to become EK Cabin Crew and going to this OD is that, then this is the answer to your question!!!
Best of luck and remember to share your experience so that others could learn from it
